KR100827202B1 - Construction method of site-cast concrete underground structure, panel member for formwork frame used in this construction method and installation method - Google Patents

Abstract

The present invention is the construction method of the site-casting concrete underground structure that enables the construction of underground structures without the need to provide excavation clearance work space, which is the space between the soil collapse prevention pile and the structure, formwork used in the construction method It relates to a frame combined panel member and its installation method.

The present invention improves the pull-out performance of the anti-collapsing piles compared with the conventional method, and at the same time meets the requirements of friction reduction performance that does not affect the structure, load-bearing capacity as a formwork to withstand the pressure of concrete placing, watertightness performance and non-corrosiveness of the side wall part of the underground structure. The method of constructing the site-cast concrete basement structure that established the construction method of contacting or approaching the formwork panel member which satisfies the formwork frame to satisfy the soil collapse, the formwork panel member for the formwork used in this construction method and its installation method to provide.

In the present invention, the surface facing the soil collapse pile has a frictional resistance of less than 0.05N / mm2, and the other surface has a concrete adhesion of 0.10N / mm2 or more, and is excellent in watertightness and non-corrosive, and thus does not deform when cast concrete. Provides a combined panel member and its installation method.

Description

Method for constructing an underground concrete structure, a panel used as concrete forms for the method, and the method for installing the Panel}

The present invention relates to a method for constructing a cast-in-place concrete underground structure by an excavation method, and more particularly, in order to finally remove the soil collapse pile, it is necessary to install and demolish the concrete formwork frame on the side of the underground structure. The present invention relates to a method of constructing a site-cast concrete underground structure that enables the construction of underground structures without the need to provide excavation clearance work space, which is a space between the soil collapse prevention pile and the structure.

In addition, the present invention is a formwork panel member and a method of installing the formwork frame having a frictional reduction effect that does not directly affect the structure when the soil collapse prevention pile pull-out in the construction method of the site-cast concrete underground structure It is about.

Conventionally, in Fig. 1, a) is a plan view, b) is a sectional view, and c) is a sectional view of a form support process before concrete placement, and when the site-cast concrete underground structure 304 is constructed by an excavation method, as shown in these figures, After installation of the soil collapse prevention pile 301, and excavation and removal of the soil inside the pile, a general formwork frame 302a is installed. Then, the reinforcing bar 311 is disposed on the inner side, and the mold inner mold 303 is further installed on the inner side, and then the general mold outer mold 302a and the mold inner mold 303 are connected by the separator 317. Placing concrete by securing the prescribed wall thickness of the underground structure (304).

In FIG. 1, 305 is the haunt of the underground structure, 306 is the foundation crushed stone layer based on the underground structure, 307 is the foundation concrete layer for the blockage and disposal of the surface, 308 is the earth support hole, 309 Is the perforation debris, 310 is the perforated plate. For the form support process, (311) is the rebar, (312) the joist, (313) the yoke, (314) the longitudinal horn, (315) the lateral horn, (316) the pipe supporter, and (317) It is a separator.

The general formwork frame 302a in the above is installed at intervals of 80 to 150 cm called excavation clearance (P) in the soil collapse prevention pile 301. The excavation clearance P is provided with a general formwork frame 302a to secure a space for people to enter and work when the concrete is removed after construction hardening. Therefore, in the case of constructing the underground structure 304, the excavation width (P) is constructed on both sides along the underground structure 304 to be constructed, so the excavation width is usually 80 to 150 cm more than the width of the desired underground structure 304. It was necessary to excavate as much as 160 ~ 300cm twice.

For this reason, construction on narrow roads was difficult, and the amount of excavation work, construction time, and construction cost were also required by 20-30%. The general formwork frame 302a used herein refers to a mold plywood and a metal formwork.

In some cases, the underground structure 304 may be constructed without constructing the excavation clearance P as described above. However, in this method, after the concrete pouring of the underground structure 304 is finished and backfilled, the soil collapse prevention pile 301 would like to be drawn out, but the pullout force of the soil collapse prevention pile 301 directly acts on the structure and adversely affects the structure. Since the soil collapse pile 301 is buried in the ground as it is not drawn. In this case, wooden formwork is often used for the formwork frame 302a, and road surface settlement is also feared due to the reduction of soil volume due to long-term corrosion of the wood.

In addition, various underground life lines, such as electricity, gas, telecommunications, and water and sewage, which are necessary to form a living base, are buried in public underground spaces such as the lower part of the road, and underground public spaces of roads are very valuable in a narrow country. Therefore, in order to effectively use this space, the soil collapse prevention pile 301, which is a temporary material, needs to be removed in principle so as not to interfere with other buried works or civil works.

In addition, in case of wooden formwork, it is necessary to dismantle it in principle because it is a factor of uneven settlement of the road due to the effect of the volume reduction caused by corrosion. For the sake of excavation and after backfilling, the method of drawing up the soil collapse prevention pile 301 is still generally practiced. As a result, the conventional construction method that requires the excavation margin (P) increases the excavation range, the problem of impairment of traffic flow due to the road occupancy work, the problem of the excavation soil treatment occurring during construction and the increase of construction cost This problem has been solved.

The present invention is to solve the conventional problems as described above, the object is

It improves the pull-out performance of anti-collapsing piles compared with the conventional method, while satisfying the requirements of friction reduction performance that does not affect the structure, load-bearing capacity as a formwork to withstand the pressure of concrete placing, watertightness performance and non-corrosiveness of the side wall part of the underground structure. Construction of site-cast concrete basement structures that can be constructed to avoid the extra excavation margin of 160-300 cm required by conventional construction methods by establishing a construction method that contacts or approaches the panel frame for both external appearances and piles. A method, a formwork panel member for formwork used in this construction method, and a method for installing the same are provided.

And another object of the present invention is to avoid the excavation margin

A) The reduction in the excavation width, that is, the reduction of the work width on the upper road and the reduction of the air due to the reduction of the excavation scale, can reduce the scale and duration of the impediment of traffic flow.

B) By reducing the size of the excavation, the amount of soil generated can be reduced by 20 ~ 30%, and the amount of dump truck used for construction can be reduced by eliminating the soil backfilled in the excavation margin. It can also reduce gas emissions and contribute to the preservation of the environment as a countermeasure against global warming.

C) The reduction of the excavation scale reduces the construction volume and reduces the construction cost,

D) Provide construction method of site-cast concrete basement structure that can be reused because it is possible to dismantle soil collapse prevention pile, which is temporary construction material, formwork panel panel formwork used for this construction method and installation method have.

The present invention to achieve the above object,

In the construction method of the site-cast concrete underground structure by excavation method in claim 1,

Excavating the soil by installing a pile preventing dirt collapse;

The surface facing the soil collapse prevention pile has a frictional resistance of less than 0.05N / mm 2, and the other surface has a concrete adhesion force of 0.1N / mm 2 or more, and is a watertight and non-corrosive formwork panel member having a watertightness and non-corrosive pile. Constructing a contact;

Inserting a panel member support and position adjustment support member between the soil collapse prevention pile and the formwork panel member;

Installing a formwork inner mold panel member on an inner side and temporarily fixing the formwork mold panel member and the formwork mold panel member as an auxiliary material;

Placing concrete between the formwork frame panel member and the formwork frame panel member; And

The poured concrete and the formwork frame is integrated and the step of drawing the soil to prevent the collapse; provides a construction method of the site-pouring concrete underground structure comprising a.

The method of claim 2, wherein the step of temporarily fixing the formwork inner mold panel member and the formwork outer mold panel member as an auxiliary material is a horizontal direction to prevent deformation of the formwork inner mold panel member horizontally between the formwork inner mold panel members. Provides a method of construction of the site-casting concrete underground structure, characterized in that to support the installation of the pipe supporter.

The invention of claim 3 is a formwork panel member for contact with the soil collapse preventing piles for use in the construction method according to the excavation method of the cast-in-place concrete underground structure, the surface facing the soil collapse preventing pile is frictional resistance It provides a formwork panel panel member having a shape smaller than 0.05 N / mm 2, the other side of which has a concrete adhesion of 0.1 N / mm 2 or more, and is watertight and non-corrosive.

According to the invention of claim 4, a support member for positioning the panel member supporting corner members is vertically inserted between the soil collapse prevention pile and the formwork frame-use panel member, and the panel member on the formwork formwork panel-member side. Provided is a method of installing a formwork panel member according to claim 3, which is temporarily fixed with a nail or a stapler on the side of the support leg.

The method of claim 5, wherein a connection earth for connecting the formwork frame member for contact with the soil collapse preventing pile to be connected to the soil collapse preventing member is used for the joint between the panel members. To provide.

According to the invention of claim 1, since the surface facing the soil collapse prevention pile of the formwork frame is made of a material having a small frictional resistance, the soil collapse prevention pile can be stably pulled out in the ground, and the pulling force is underground. Since it does not affect the structure, it is possible to draw out the soil to prevent soil collapse, which can be reused.

In addition, since there is no need to construct excavation margin on the side of the underground structure, the underground structure can be constructed by reducing the excavated soil volume by reducing the excavation width to be excavated. This means that the excavated soil must be transported to the Xantha Land for each excavation, and especially when the Xanthan Land is insufficient, such as urban areas, the construction period is shortened and contributing to the resolution of social problems beyond the reduction of construction cost.

The invention of claim 2 is to provide a construction method by omitting the supporting jig of the concrete wall thickness of the underground structure in the construction method by the excavation method of the cast-in-place concrete underground structure, the underground structure in the installation portion of the wall thickness supporting jig, which has been a problem conventionally It is effective as a countermeasure for the softening of underground structures since the inflow of groundwater can be prevented.

According to the invention of claim 3, since the surface facing the soil collapse prevention pile is made of a material having low frictional resistance, it is possible to stably and easily pull out the soil collapse prevention pile in the ground so that the pulling force does not affect the underground structure. It is a formwork panel member used for formwork. The formwork mold embedded in the ground is integrated with the underground structure, but because it has non-corrosiveness and watertightness, it functions as a waterproofing material on the side of the underground structure and thus has good efficiency.

In addition, if the frictional resistance of the surface opposite to the anti-collapsing pile is less than 0.05N / mm2 and the adhesive force is more than 0.1N / mm2, which is easy to install on the concrete of the other side, it is surely integrated with the structure even after drawing the anti-collapsing pile. In addition to the panel member materials shown in the examples, an equivalent effect is expected in environmental and economic aspects.

The invention of claim 4 is a method of installing a formwork panel member for contact with or close to the soil collapse preventing pile used in the construction method by the excavation method of the site-cast concrete underground structure. This installation method inserts a support member for positioning the panel member supporting angles so that the panel member supporting angles are vertical between the soil collapse pile and the formwork panel member for formwork. Temporarily fix with nails or staplers on the side. In the case of concrete pouring, it is possible to easily demolish the supporting material after concrete hardening by improving the vertical accuracy of the sidewall of the underground structure, and the utilization of finite resources can be improved by using thinning material for the supporting material.

According to the invention of claim 5, the panel member and the panel are connected to each other without a gap between the panel member and the panel having a formwork for forming a frame, which is installed in contact with or adjacent to the soil collapse prevention pile used in the construction method by the excavation method of the site-cast concrete underground structure. By using it at the joint part of a member, installation of a panel member becomes easy and it can prevent concrete from flowing in a panel member joint part.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In the following, it will be described first by comparing the conventional method of Figure 1 and the present invention method of Figure 2 so that it is easy to understand how the conventional excavation method and the present invention method is different in the excavation width, the cavity hole width and the form support hole. do. Figure 2 is a construction method of the excavation clearance (P) of the present invention, a) a plan view showing a construction state of the underground structure 104 constructed, b) cross-sectional view, c) is a cross-sectional view of the form support process before concrete casting. .

In Figure 2, the present invention is provided with a substantially mountainous structure, and alternately installed in alternating directions, and the cross-sections engaging each end are roughly uneven soil prevention piles 101, and A plate body having a thickness of approximately 15 mm, which is a formwork panel member 102b for the underground structure 104, a formwork inner frame member 103 for the underground structure 104, a height of 3 m and a width of 2.7 m underground structure 104 is shown.

Also, in Fig. 2, reference numeral 105 denotes the haunt of the underground structure, 106 denotes a foundation crushed stone layer based on the underground structure, 107 denotes a foundation concrete layer for blockage and abandonment of the surface thereof, and 108 denotes an earth support hole. ) Is the perforated barn, and 110 is the perforated plate. Regarding the formwork hole, 111 is a reinforcing bar, 112 is a joist, 113 is a yoke, 114 is a longitudinal angular shell, 115 is a lateral angular shell, and 116 is a pipe supporter.

According to the conventional construction method for constructing the excavation clearance P in FIG. 1, the excavation width is 4.6 m and the cavity hole width is 6.0 m. And the structure by this invention of FIG. 2 is 3.05 m in excavation width, and 4 m in hole opening width. This means that the excavation width in the present invention was reduced to about 66% and the perforation width to about 67% of the conventional excavation margin (P) method, respectively. In addition, the formwork dual frame panel member 102b is constructed in contact with or close to the soil collapse prevention pile 101. The fixing method is processed as shown in FIGS. 3 and 4.

As shown in Figs. 3 and 4, the soil disintegration prevention pile 101 is installed in alternating directions by alternating steel piles 101a having roughly cross-sections, and installed at each end of each steel pile 101a. It is comprised by connecting each steel pile 101a by mutually latching one stop part 101b. In the method shown in Fig. 3, the panel member supporting shell member 119 is inserted between the locking portion 101b and the formwork panel member 102b, and the panel member supporting shell member 119 and the mold outline frame are inserted. The combined panel member 102b is fixed with a nail or stapler 121.

The method shown in Fig. 4 is a formwork panel member 102b in a state in which it is supported by a support member made of a positioning material 120 that vertically supports the panel member support horn 119 in the center of the steel pile. Secure with a short nail or stapler 121.

In addition, the panel member interconnection of the formwork frame panel member 102b may use the H-shaped connecting jig 122 for the purpose of preventing the panel member joints from crossing. The H-shaped connecting jig 122 is positioned between the formwork panel member 102b adjacent to each other at the top and the bottom thereof, and the order of installation is to first place the formwork panel member 102b at the bottom. After fixing, the H-shaped steel connecting jig 122 is placed on the lower formwork panel member 102b, and the upper die-formed panel member 102b is placed on the H-shaped steel connecting jig 122 again. The installation method is repeated.

Then, as shown in FIG. 2, the formwork mold panel member 103 is installed and concrete is poured. When placing concrete, as shown in FIG. 2 (C), the auxiliary material 118 is temporarily placed between the haunches 105 of the formwork inner mold panel member 103 and the formwork shaping panel member 102b until the concrete is finished. In addition, the separator 317 used to support the conventional wall thickness can be omitted by fixing the three formwork inner mold panel members 103 with the horizontal pipe supporter 116.

And the panel member support horn 119 and the positioning material 120, which is a corrosive material, is drawn in the ground after the underground structure 104 is cured and before the soil collapse prevention pile 101 is drawn out. In addition, the plate-shaped formwork frame panel member 102b reduces frictional resistance between the formwork frame-shaped panel member 102b and the soil collapse prevention pile 101 when the soil collapse preventing pile 101 is drawn out of the ground. It is a material that is easy to use for pouring concrete and has strength that does not deform when pouring concrete.

Specifically, as shown in FIG. 5, a polystyrene plate having a thickness of 15 mm made by coating the long-fiber reinforced polypropylene composite sheet 123b on the upper and lower surfaces of the extruded expanded polystyrene board 123a. In addition, the material that can be used for the formwork panel member 102b includes a hard vinyl chloride low foam plate, a fly ash plate made of 50% of fly ash and 50% of polypropylene, and both are commercially available. Product.

As the formwork panel member 102b for the formwork, the allowable flexural strength is not less than 5.6 N / mm 2 (equivalent to JIS K 7221-2 test), the flexural modulus is not less than 1,600 N / mm 2 (equivalent to the JIS formwork plywood test), and the absorbency is 0.01 g / 100. What is necessary is just to apply the thing of cm <2> or less (equivalent to JIS A 9511 test).

In the present invention, the plate-shaped formwork frame combination panel member 102b is a thin plate of about 15 mm, but after pouring concrete and integrating it with the underground structure 104, the plate formwork frame function does not function as a formwork form. It becomes a part, and functions as a waterproofing material. In addition, the watertight tape can be attached and waterproofed on both edges of the formwork panel member 102b facing each other. Also, when the soil collapse prevention pile 101 is drawn, the sand gap or the hard cement bent night solution or the like is filled in the air gap in which the soil collapse prevention pile 101 is embedded so as not to collapse. have.

The following measurement was conducted through experiments to determine what value the frictional resistance (shear resistance stress) of the formwork dual-use panel member 102b actually shows when the soil-collapse prevention pile 101 is drawn out. As shown in Fig. 6, the frictional resistance is changed by the lateral earth pressure on the soil-collecting pile 101 side or the concrete placing pressure on the side of the formwork double frame panel member 102b. Therefore, the pull-out force F was measured by applying earth pressure or concrete placing pressure with the improved one-side shear tester in the soil consolidation constant pressure one-side shear (DBS-CP) test method (JIS T 561-1997). The value obtained by dividing this drawing force by the installation area (φ 60, 100, 150 mm) is shown as the drawing shear stress in FIG.

7 shows examples of the expanded polystyrene plate, the hard vinyl chloride low foam plate, and the fly ash plate shown in the examples. In addition, it also indicated about the formwork plywood conventionally used. Fig. 7 shows, for example, in the case of the bottom surface level GL-10m, the unit volume weight γt = 13 kN / m 3 of soil, and the side pressure coefficient λ = 0.5, σ = λ × γｔ × ｈ = 0.5 × 13 × 10 = 65 kN / As m <2> = 0.065 N / mm <2>, this value is shown by the dashed-dotted line A of the longitudinal direction in FIG.

The drawn shear stress τ for this value (σ = 0.065 N / mm 2) is τ = 0.017 N / mm 2 for polystyrene plates, τ = 0.013 N / mm 2 for hard vinyl chloride low foam plates, and τ = 0.018 N / for fly ash plates. Mm 2 and τ = 0.021 N / mm 2 in the mold plywood. Neither of them is below the value of 0.05 N / mm 2, which is a target shear stress that does not reliably affect the structure.

In the present invention, the adhesion performance with the formwork frame panel member 102b of FIG. 5 integrated with the underground structure 104 was confirmed by an adhesion test on the expanded polystyrene plate. In the adhesive strength test, after the concrete is poured into the formwork panel member 102b for curing, the jig (area 40mm × 40mm) for the dry adhesion tester is attached to the formwork panel member 102b with an adhesive, and the gun The adhesive force was measured by pulling the jig using a soft adhesion tester. The values obtained by dividing the adhesion force by the installation area are shown by the adhesion stress fo by the concrete strength. The test results are shown in FIG. 8. It was confirmed that the adhesive force of the formwork dual frame panel member 102b to the compressive strength f'ck of the underground structure 104 constructed by the present invention is 0.1N / mm 2 or more.

The formwork formwork panel member 102b for the formwork is not limited to the above embodiment, but has watertightness as the formwork formwork for the plate shape, and is a non-corrosive material, and the surface facing the soil collapse prevention pile 101 is The frictional resistance may be small, and the other side may be in the form of a panel member having a strength that is easy to install in concrete and does not deform when placing concrete. And not limited to the earthquake-resistant pile 101 of the above embodiment is also applied to other civil construction H-type steel piles.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to such a specific structure. Those skilled in the art will be able to variously modify or change the embodiments of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Nevertheless, it will be apparent that all such modifications or design modifications to such simple embodiments will clearly fall within the scope of the present invention.

1 is a view showing the construction state of the underground structure constructed by a conventional method for comparing the embodiment according to the present invention,

a) a plan view, b) a cross-sectional view, c) a cross section of a mold support hole before concrete casting;

2 is a view showing a state of construction of underground structures according to the embodiment of the present invention.

a) a plan view, b) a cross-sectional view, c) a cross section of a mold support hole before concrete casting;

3 is a view showing a method of fixing the formwork frame member used in the embodiment according to the present invention,

a) is a plan sectional view; b) is a longitudinal sectional view;

4 is a view showing another method of fixing the formwork frame member used in the embodiment according to the present invention,

a) is a plan sectional view; b) is a longitudinal sectional view;

5 is a cross-sectional view showing the configuration of a formwork form panel member used in the embodiment according to the present invention;

6 is an explanatory diagram showing a principle of measuring the formwork frictional resistance of the formwork of the embodiment according to the present invention;

7 is a graph showing the relationship between the horizontal stress (soil pressure) σ and the drawn shear stress τ of the formwork frame member of the embodiment according to the present invention;

8 is an explanatory view showing the relationship between the vertical direction stress and the shear direction of the stress in the form of the formwork frame member used in the embodiment according to the present invention.

<Explanation of symbols for main parts of the drawings>

101,301 .... Earthquake-resistant pile 102b .... Panel panel

103,303 .... formwork frame 104,304 .... underground structure

105,305 .... Underground structure haunting 106,306 .... Basic stone

107,307 .... Foundation Concrete 108,308 .... Earth Supporter

109,309 .... Perforated Diaphragm 110,310 .... Perforated Plate

111,311 .... Rebar 112,312 .... Joist

113,313 .... Yoke 114,314 .... Longitudinal lumber

115,315 .... Transverse angle beam 116,316 .... Pipe supporter

317 .... Separator 118 .... Auxiliary Materials

119 ... Angle for supporting panel members 120 .... Positioning material

121 .... Nails or staplers 122 .... H-shaped connecting jig

123a .... Extruded Foamed Polystyrene Board 123b .... Long Fiber Polypropylene Sheet

302a .... Conventional formwork form

Claims (5)

In the construction method of site-cast concrete underground structure by excavation method, Excavating the soil by installing a pile preventing dirt collapse; The surface facing the soil collapse prevention pile has a frictional resistance of less than 0.05N / mm 2, and the other surface has a concrete adhesion force of 0.1N / mm 2 or more, and is a watertight and non-corrosive formwork panel member having a watertightness and non-corrosive pile Constructing a contact; Inserting a panel member support and position adjustment support member between the soil collapse prevention pile and the formwork panel member; Installing a formwork inner mold panel member on an inner side and temporarily fixing the formwork mold panel member and the formwork mold panel member as an auxiliary material; Placing concrete between the formwork frame panel member and the formwork frame panel member; And Construction method of the site-cast concrete underground structure comprising a; concrete and the formwork frame is integrated and the step of drawing the soil preventing piles. The method of claim 1, wherein the step of temporarily fixing the formwork inner mold panel member and the formwork outer mold panel member as an auxiliary material is a horizontal to prevent deformation of the formwork inner mold panel member horizontally between the formwork inner mold panel members. Construction method of the site-pouring concrete underground structure, characterized in that it comprises the step of installing and supporting the pipe supporter in the direction. In the formwork panel member for contact form, which is constructed in contact with the soil collapse prevention pile for use in the excavation method of the site-cast concrete underground structure, the surface facing the soil collapse pile has a frictional resistance of 0.05 N / mm2. Formwork panel panel member, characterized in that the smaller, the other side is more than 0.1N / mm2 of concrete adhesion, and is watertight and non-corrosive. A support member for positioning the panel member supporting corner member to be vertical is inserted between the soil collapse prevention pile and the formwork panel member for both sides, and the panel member supporting panel member side is placed from the formwork panel member side. A method of installing a formwork / panel member according to claim 3, which is temporarily fixed with a nail or a stapler. The method according to claim 4, wherein a connecting jig for connecting the formwork frame member for contact with the soil collapse preventing piles without misalignment is used for a joint between the panel members. Way.

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